Rolling mill

ABSTRACT

A rolling mill having transoms that extend across the roll stand and support the roll bearings, the transoms being locked in place by removable pins.

United States Patent Muller Feb. 18, 1975 ROLLING MILL [56] References Cited [75] Inventor: Hubert Muller, Grevenbroich, UNITED STATES PATENTS Germany 1.943,]42 1/1934 Peters 72/238 X [73] Assignee: SIEMAG Siegener Maschinenbau 37 cl 3 5 GmbH Hilchenbach Dahlbruch ison l 3,l72,3l4 3/1965 Morgan ct a]. 72/237 Germany $580,034 5/1971 Wilson I. 72/237 {govI BI'CISChflGIdCI' [2]] p N05 4181442 Primary ExaminerMiIt0n S. Mehr Attorney, Agent, or FirmN0rman S. Biodgett; Gerry {30] Foreign Application Priority Data Blodgett Dec. 19. 1972 Germany 2262014 [57] ABSTRACT [52] [1.5. C]. 72/238 A rolling mill having transoms that extend across the [51] Int. Cl BZlb 31/08 roll stand and support the roll bearings, the transoms [58] Field Of Search 72/238, 239, 240, 237, being locked in place by removable pins.

l 3 Claims, 1 Drawing Figure 10 1611 14 12 12 L 13 15 1s 17 19 ["1 I i g d I 21 ROLLING MILL BACKGROUND OF THE INVENTION It is common practice in the design and construction of a rolling mill stand to provide the housings with open-top windows that are joined at the top by a transom which also serves to support the roll bearing chocks. The transom is suitably locked to the top of the housing. For instance, in one previously-known construction of such a stand, the cotter pins providing the connections between the tie shackles and the roll inserts or chocks are arranged at the transoms, so that they must be changed along with the transoms during a change of rolls. This arrangement has not only the disadvantage that the transoms of each set of rolls must be equipped with such cotter pins, but that also these cotter pins must be moved individually out or in before or after each change of rolls, respectively. The actuation of the cottor pins requires a relatively great amount of time, during which time the the roll stand (and thus the entire mill train of which the roll stand forms a part) is out of action. These and other difficulties experienced with the prior art devices have been obviated in a novel manner by the present invention.

Such shackle stands have the advantage, compared with roll stands of conventional construction, that, in spite of a lighter construction of the roll housing, they display a greater rigidity and, therefore, permit rolling operations to be performed to narrower tolerances. A further advantage of these rolling mill stands is that they facilitate a simpler and quicker change of rolls, since for this purpose only one cotter pin at each shackle needs to be released to free the chocks for the change of rolls.

SUMMARY OF THE INVENTION In general, the present invention consists of a roll stand for exchangeable sets of elongated rolls, comprising a roll housing, a plurality of support means for supporting an end of a roll. Each means is provided at opposite sides thereof with an apertured portion. A corresponding plurality of pairs of shackles is provided, each shackle having a first end portion connected to the roll housing and a second end portion, which is fork-shaped so as to have two limbs, each limb having one of two mutually aligned apertures being spaced apart to receive therebetween a respective one of the apertured portions of the support means. This is so that the aperture of the support means is aligned with each of the two apertures of the limbs and so that a cotter pin can be inserted to extend through all three of the apertures.

Each shackle is advantageously provided with a cylinder and piston device operable by a pressure medium and mounted on one of the limbs at a face remote from the respective other limb of the shackle, the piston being drivingly connected to one such cotter pin.

Expediently, each apertured portion of the support means is provided in a wall member thereof, the wall member each being in conjunction with further wall members of the support means to define a recess to receive one limb of a shackle.

BRIEF DESCRIPTION OF THE DRAWINGS The character of the invention, however, may be best understood by reference to one of its structural forms, as illustrated by the accompanying drawing, in which:

The single FIGURE of the drawing shows partially in section and partially in front elevation a part of a rolling mill embodying the principles of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing, there are shown portions of two roll housings 1 and 2 ofa roll stand, namely only those portions, in which tie shackles 3 and 4 are suspended. The tie shackle 3 is shown as having bearing pins 5, which fit into bores in the roll housing 1 and between which is disposed an eccentric collar 6, which is in engagement with a bore in the tie shackle 3. The bearing pins 5 together with the eccentric collar 6 are rotatable by means of a gear, of which only a pinion 7 is indicated, so that a repositioning of the tie shackle 3 can be effected by rotation of the eccentric collar 6.

The tie shackle 4 is coupled in like manner to the roll housing 2, as are all further tie shackles, which are not shown in the accompanying drawing and which belong to the same rolling mill stand.

Displaceably guided between the two roll housings 1 and 2 are inserts or chocks 8, in which rolls 9 are rotatably journalled. These chocks 8 are supported against a transom 10 at their ends remote from the rolling gap. These transoms 10 act together with the chocks 8 as support means for the rolls and are formed at each of their ends with a pocket 11, an outer wall 12 of which is provided with a bearing eye or bore 13.

Each of the ends of the tie shackles 3 and 4 remote from the roll housings l and 2 is in the shape of a fork,

one fork limb 14 of which (as indicated in the case of tie shackle 3) projects into the pocket 11 of the transom l0 and one fork limb 15 of which rests against the outside of the pocket wall 12.

The fork limbs 14 and 15 of the tie shackles 3 and 4 have bores 16 and 17, respectively, which are aligned with the bearing bore 13 in the pocket wall 12, when the fork limbs 14 and 15 bracket the pocket wall 12.

A pressure medium cylinder 18 or 19 is attached on the outer side of each fork limb 15 of the tie shackles 3 and 4. A piston 20, with which one cotter pin 21 is firmly connected, is displaceably guided in each of these pressure medium cylinders 18 and 19. By appropriate loading of the pressure medium cylinders 18 and 19, this cotter pin can be withdrawn with the aid of the piston 20 to suchan extent that its free end is retracted into the bore in the fork limb 15. The bearing bores 13 of the transoms 10 are thus uncoupled from the shackles 3 and 4, so that the transoms l0 and together with the chocks 8 and the rolls journalled therein can be removed from the roll stand.

Conversely, the cotter pin 21 can be driven by the piston 20 out of the pressure medium cylinder 18 or 19, respectively, to such an extent that it penetrates the bearing bore 13 of the transom 10 into the bore 16 of the fork limb 14 and thereby brings about the coupling connection between the transom l0 and the tie shackles 3 and 4.

All the pressure medium cylinders 18 and 19 associated with one roll stand may conveniently be connected to a common pressure medium system in such a manner, that all cotter pins 21 can be controlled from a central location to be moved simultaneously in order to accelerate the roll change.

During each roll change, all the tie shackles 3 along with the cotter pins 21 (as well as the pressure medium cylinders 18 and 19 actuating them) remain in the roll housings 1 and 2. Thus, only the roll sets and the transoms associated with them need be exchanged during a roll change.

A major advantage attainable by means of a rolling mill stand embodying the features described hereinbefore is that the period of time occupied by a roll change can be substantially reduced and that the parts facilitating the change of rolls may be of simplified construction. For rolling mill stands selectably equippable with universal or horizontal sets of rolls, there results a further advantage: transoms, which equalize differences in the roll diameters and only require the use of spacers, by which thewear of the rolls can be compensated, can be manufactured at relatively low cost.

It is obvious that minor changes may be made in the form and construction of the invention without departing from the material spirit thereof. It is not, however, desired to confine the invention to the exact form herein shown and described, but it is desired to include all such as properly come within the scope claimed.

The invention having been thus described, what is claimed as new and desired to secure by Letters Patent 1. A rolling mill having exchangeable sets of rolls, in which the chocks serving for bearing the rolls are releasably coupled by interposed transoms operating through tie shackles with the roll housing, wherein cotter pins serve as coupling means,

characterized by the fact that the end of each tie shackle (3, 4) engaging the transoms (l0) and the chocks (8) is constructed as a fork (l4, 15), between the limbs (14, 15) of which a coupling eye (13) of the transom engages, the cotter pin (21) being insertable in bores (l6, 17) in the fork limbs (14, 15) and the coupling eye (18, 19, 20).

2. A rolling mill as recited in claim 1,

characterized by the fact that the cotter pin (21) is part of a piston (20) displaceable in a pressure medium cylinder (18, 19) and the pressure medium cylinder (l8, 19) is mounted on the outer fork limb (15) of each tie shackle (3, 4).

3. A rolling mill as recited in claim 2,

characterized by the fact that the coupling eyes (13) at the transom (10) are formed in the outer walls (12) of a pocket (11) formed in the transom. l l 

1. A rolling mill having exchangeable sets of rolls, in which the chocks serving for bearing the rolls are releasably coupled by interposed transoms operating through tie shackles with the roll housing, wherein cotter pins serve as coupling means, characterized by the fact that the end of each tie shackle (3, 4) engaging the transoms (10) and the chocks (8) is constructed as a fork (14, 15), between the limbs (14, 15) of which a coupling eye (13) of the transom engages, the cotter pin (21) being insertable in bores (16, 17) in the fork limbs (14, 15) and the coupling eye (18, 19, 20).
 2. A rolling mill as recited in claim 1, characterized by the fact that the cotter pin (21) is part of a piston (20) displaceable in a pressure medium cylinder (18, 19) and the pressure medium cylinder (18, 19) is mounted on the outer fork limb (15) of each tie shackle (3, 4).
 3. A rolling mill as recited in claim 2, characterized by the fact that the coupling eyes (13) at the transom (10) are formed in the outer walls (12) of a pocket (11) formed in the transom. 